[MAPREDUCE-4517] Too many INFO messages written out during AM to RM heartbeat

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.23.1, 2.0.1-alpha
• Fix Version/s: 2.0.3-alpha, 0.23.5
• Component/s: applicationmaster
• Labels: patch
• Target Version/s: 2.0.3-alpha, 0.23.5
• Tags: applicationmaster
• Assignee: Jason Darrell Lowe
• Reporter: James Kinley
• Created: 05/Aug/12 19:40
• Updated: 03/Sep/14 23:17
• Resolved: 13/Nov/12 23:50

Description

Too many INFO log messages written out during AM to RM heartbeat. Based on default frequency of 1000ms (scheduler.heartbeat.interval-ms) either 2 or 4 INFO messages are written out per second:

LOG.info("Before Scheduling: " + getStat());
List<Container> allocatedContainers = getResources();
LOG.info("After Scheduling: " + getStat());
if (allocatedContainers.size() > 0) {
LOG.info("Before Assign: " + getStat());
scheduledRequests.assign(allocatedContainers);
LOG.info("After Assign: " + getStat());
}

These should probably be changed to DEBUG message to save the log growing too quickly.